mobile/tablet programming

[jmcilhinney]

How do you detect if it's mobile or tablet to redirect them to mobile site?

I've never actually done it myself but I believe that it's a matter of looking at the Page.Request.Headers to find information about the browser and platform and then redirecting as appropriate if required.

and how to convert a site to a mobile site?

There is no "conversion". Let me repeat what I said in my previous post: there is no specific technology difference between a web site and a web site intended for mobile devices. It's purely the fact that the pages are designed to contain less data. There are some conventions, including the site being configured with a URL like m.domain.com instead of www.domain.com.